Larry Ellison, who just turned 68 and is among the planet's most recognizable billionaires, has plenty besides work to keep himself busy, including his fast cars, jets, yacht racing and a newly purchased Hawaiian island. More about him:

Position: CEO at Oracle since co-founding the company in 1977

Age: 68

Education: Attended University of Chicago and University of Illinois, but he didn't graduate

Primary residence: Woodside

Personal: Divorced four times, with two grown children

Annual compensation: $96.2 million last fiscal year, most of it in stock options